The alpha-esterase-7 carboxylesterase, E3, from the blowfly Lucilia cuprina: phosphorylated-enzyme ensemble refinement

Experimental Data Snapshot

  • Resolution: 1.53 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

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Mapping the Accessible Conformational Landscape of an Insect Carboxylesterase Using Conformational Ensemble Analysis and Kinetic Crystallography.

Correy, G.J.Carr, P.D.Meirelles, T.Mabbitt, P.D.Fraser, N.J.Weik, M.Jackson, C.J.

(2016) Structure 24: 977-987

  • DOI: https://doi.org/10.1016/j.str.2016.04.009
  • Primary Citation of Related Structures:  
    4QWM, 4UBI, 4UBJ, 4UBK, 4UBL, 4UBM, 4UBN, 4UBO, 4W1P, 4W1Q, 4W1R, 4W1S, 5CH3, 5CH5, 5IVD, 5IVH, 5IVI, 5IVK

  • PubMed Abstract: 

    The proper function of enzymes often depends upon their efficient interconversion between particular conformational sub-states on a free-energy landscape. Experimentally characterizing these sub-states is challenging, which has limited our understanding of the role of protein dynamics in many enzymes. Here, we have used a combination of kinetic crystallography and detailed analysis of crystallographic protein ensembles to map the accessible conformational landscape of an insect carboxylesterase (LcαE7) as it traverses all steps in its catalytic cycle. LcαE7 is of special interest because of its evolving role in organophosphate insecticide resistance. Our results reveal that a dynamically coupled network of residues extends from the substrate-binding site to a surface loop. Interestingly, the coupling of this network that is apparent in the apoenzyme appears to be reduced in the phosphorylated enzyme intermediate. Altogether, the results of this work highlight the importance of protein dynamics to enzyme function and the evolution of new activity.

  • Organizational Affiliation

    Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carboxylic ester hydrolase577Lucilia cuprinaMutation(s): 0 
Gene Names: LcaE7
EC: 3.1.1
Find proteins for Q25252 (Lucilia cuprina)
Explore Q25252 
Go to UniProtKB:  Q25252
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ25252
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on DPF

Download Ideal Coordinates CCD File 
C4 H11 O4 P
Experimental Data & Validation

Experimental Data

  • Resolution: 1.53 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.816α = 90
b = 101.254β = 90
c = 225.818γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-22
    Type: Initial release